Check out the git tag OTP-19.3.6.9, and build a full OTP system
including documentation. Apply one or more applications from this
build as patches to your installation using the 'otp_patch_apply'
tool. For information on install requirements, see descriptions for
each application version below.

Note! The ssh-4.4.2.4 application can *not* be applied independently
of other applications on an arbitrary OTP 19 installation.

On a full OTP 19 installation, also the following runtime
dependencies have to be satisfied:
-- crypto-3.7.3 (first satisfied in OTP 19.3)
-- public_key-1.4 (first satisfied in OTP 19.3)
-- stdlib-3.3 (first satisfied in OTP 19.3)